Ecuadorian Foreign Minister Ricardo Patino announced the decision Thursday in Quito, saying Assange's personal security was at risk. He said Assange would not receive a fair trial if he is eventually extradited to the U.S.

Key Dates in WikiLeaks

2006: Set up by a group of people, including Australian Julian Assange2008: Publishes Sarah Palin hacked emails2009: Posts thousands of text messages from U.S. emergency workers and military personnel from September 11, 20012010: Releases hundreds of thousands of classified U.S. military documents and diplomatic cables2011: Assange appeals extradition from Britain to Sweden on sex crime charges2012: British court upholds extradition of Assange, who takes refuge in Ecuador's embassy in London. Ecuador grants him asylum in August

Britain Foreign Secretary William Hague said Britain will not give Assange safe passage out of Britain and is determined to extradite him to Sweden.

Assange is wanted in Sweden for questioning in connection with sexual assault allegations. He has denied those accusations.

Following the decision, Sweden summoned Ecuador's Stockholm-based ambassador. A Swedish government spokesman said it is "unacceptable" that Ecuador is trying to halt Sweden's judicial process.

One of Assange's lawyers urged a Swedish prosecutor to come to London to interrogate the WikiLeaks founder, saying it is no longer possible to question him in Sweden because he has been granted asylum.

Assange took refuge in Ecuador's embassy in London nearly two months ago after losing a legal battle to fight extradition to Sweden.

Outside the Ecuadorian embassy Thursday, British police tussled with protesters chanting slogans in support of Assange. At least three protesters were arrested.

Ecuadorian officials have accused Britain of threatening to storm Ecuador's embassy to arrest Assange. Britain has warned of using a law that would allow it to revoke the embassy's diplomatic status.

Assange fears Sweden could send him to the United States to face possible charges related to the 2010 release of hundreds of thousands of classified documents, including diplomatic cables held by the U.S. State Department about the wars in Iraq and Afghanistan.